Arsenic sensor development based on modification with (<i>E</i>)-<i>N</i>′-(2-nitrobenzylidine)-benzenesulfonohydrazide: a real sample analysis

(<italic>E</italic>)-<italic>N</italic>′-(2-Nitrobenzylidene)-benzenesulfonohydrazide was prepared from 2-nitrobenzaldehyde and benzenesulfonylhydrazine by using a condensation method and applied as a selective As³⁺sensor.